User blog comment:Dante-Must-Die-Mode/What The Heaven And Hell?: Nero/@comment-109.243.92.158-20150330005830

I don't know is this right but when your first meet Agnus he mention that they started research on demonic power few years ago and its stated that Vergil visted Fortuna many years before Dante arrival. So what if  something happend to Vergil during that visit that broke the Yamato.

During that visit he could meet women who would be Nero future mother  they fell in love and she got pregrant but someone or something killed her and Vergil decided to avenged her death and went to leave Nero in front of ophanage in black blanket (which could be memento from Nero mother) and went to fight whaterver killed Nero mother and Yamato get broken during that fight alongside Nelo Angelo armor Order them found it and started they research on demonic powers.